Dynamo-electric machine.



, w. W. DEAN. DYNAEQ ELECTRIC MACHINE.

APPLIGATION rum) NOV. 21, 1910'.

Patented .Feb. 9, 1915.

lnvenfof Will/am hf Dean &0 W

NITED STATES PATENT OFFICE.

WILLIAM 11V. DEAN, ELYRIA, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, TO THE GARFORD MANUFACTURING COMPANY, OF ELYRIA, OHIO, A CORPORATION OF OHIO.

DYNAMO-ELECTRIC MACHINE.

. a citizen of the United States, residing at Elyria, in the county of Lorain and State of Ohio, have invented certain new and useful Improvements in Dynamo Electric Machines; and I dohereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention-relates to electric generators and more particularly to magneto elec tric machines, such as are employed for ignition .purposes in connection with explo sive engines, though I do not desire to be limited to this particular use. Where engines of this character are employed in connectionwith self propelled vehicles, such as automobiles, motor boats, aeroplanes and the like, economy of room is one-of the factors of good design. Owing to the fact that the magneto is associated with the other parts by conductors. the position of the mechanism is not definitely determined by the cooperating parts of the two machines. Consequently, the magneto maybe placed in a va cant, though inaccessible position if its design is such that the parts may be easily and readily reached. One-of the vital parts of the magneto which is apt to be disarranged so as to interfere with the proper working of the machineconsists of the contacts employed to make and break the ignition circuit. In all of the machines now in use these contacts are in more or less inaccessible'positions. V

It is one of the objects of my invention to bring these-contacts forward to such a position that they maybe, easily inspected and adjusted with the hands or an ordinary tool. Terminal contacts are also provided for the ignition circuit. The wiresof this circuit are attached to these terminals, which are associated with the contacts in such a way that the cover which is used to protect the contacts may be removed and the contacts inspected Without disconnecting the conduc-.

tors. This enables me to inspect and adjust the contacts while the engine is running.

I also aim to produce a device, which is a good manufacturing proposition and which may be conveniently'and cheaply constructed and operated.

Specification of Letters Patent.

Fatented Feb. 9, 1915.

Application filed November 21, 1910. Serial No. 598,351.

Other objects of my invention and the details of the apparatus will be best understood by reference to the following description'when taken in connection with the accompanying illustration showing one specific embodiment thereof, while its scope will be more particularly pointed out in the appended claims.

Figure 1 is an end elevation of a magneto with the contact cover removed. Fig. 2 is a horizontal cross-section taken through the machine showing the contact cover in place. Fig. 3 is a detail of Fig. l.

Referring now to the drawing, 1 is the frame of the machine, 2 are the horseshoe magnets, which are mounted in the frame and which constitute the field of the machine. 3 is a cover therefor.

l is the armature mounted between the .ends of the horseshoe magnet and adapted to rotate in the field thereof.

5 is thearmature shaft which carries a cam 6 upon one end. This cam rotates with the shaft and operates the contacts which are to be described. A spur wheel 7, is mounted on the shaft and rotates a second spur wheel, not shown, but which operates a rotary contact member inclo'sed in a box 8. This is so well understoodthat it will not be described here, as anv useful form may be employed and in addition this arrangement is only auxiliary to my invention. The pole pieces are shown at 9. A trunnion 10 carried upon a trunnion plate 11 is fastened by screws 12 to the frame. A supporting plate 13 is mounted to rotate upon the trunnion 10. A screw Ll prevents rectilineal motion of the supporting plate and limits its motion to rotation upon the trunnion. '1 his screw passes through a slot in the cylindrical part' of the supporting plate which encompasses the trunnion into a threaded hole in the trunnion. 16 is the cover of this slot, which is held in, place by the screw.

The armature shaft is concentric with this trunnion and passes through the same."

adjusted, consists of an adjustable screw whichis mouhted upon a plate 19 leading to the terminal; ccntactflt). The contact- 18,

consists of a flexible snring which is mounted at21 upon the frame of the supporting plate. A conductor 22 engages the end of the armature shaft at one end and is connected to a contact plate 2-5 at the other end. Asshown in Fig. 8, the plates 19 and 23 are covered with insulation. The other terminal contact is shown at 24 and is mounted upon the plate 23. sThe member 22 consists ofa leaf Spt'lllfibGllt in the form of an arc which cai'riesfi eontact 25 upon the end, cn gaging the end of the armature shaft. The contact 25 is thus spring pressed against the end of the armature. The edge of the supporting plate is channeled as shown at 30. A layer of cushion material 31 is placed in the bottom of this channel. 32 is a hollow cover, whose edges fit in this channel and which may be attached to the supporting plate by means of a bolt 33 and a nut 34. Channels are cut in the insulation of the members 19 and, 23 to admit the edge of this cover. The edges of this cover are insulated from the contact members 19 and 23 by layers of insulation placed on top of these members. The terminal contacts 20 and2 1 .thus project beyondthat portion of the area of the supporting plate inclosed by the cover plate The cover plate maybe remoyed, as readily seen, without detaching the conductors from these terminals. While I hare shown this particular arrangement, I may also bring the terminals forward and then carry them to one side of the plate, cutting the edge of the plate away to permlt the passage of the terminals-to the outside.

One terminal of the armature is connected to the frame and is connected theretl rough to the spring 18. The other terminal of the.

armature is connected through the armature shaft to the terminal 2d. The other terminal of the circuit is connected to the contact 17 through the terminal 20. \Vhen the switch 1718 is closed, this circuit is complete. Upon the upper side of the spring '18, 1

show a buffeting member 35. As the armature rotates, the cam 6, mounted thereon, engages this buifeting member and forces the spring contact 18 away from the contact 17 breaking the circuit. By making the support plate substantially flat and providmg a hollow cover for the parts carried thereon, I make the contacts more accessible than if the plate consisted of a box having walls and an end cover therefor. Such a box would be of sucha size that it would be impossibleto insert the fingers into the box to adjust the contacts, because the box, as ordinarily constructed, is too small. Were this structure employed, it would be also necessary tocarry the slotted end of the screw 17 outside the box in order to reach it with ascrew driver or to provide an opening through which the. screw-driver might be inserted. Either of these wouldbe. objec- The supporting plate 13 withthe, mem-.

bers carried thereon may be rotated through the arc of the circle upon the trunnion 10 in order to change the relation between the point at which the circuit is interrupted at the contacts .17 and 18 and the position of the armature. This is effected through a member 40 which may be connectedwith a hand or mechanically operated member.

A diagram of the circuits used is shown in connection with Fig. 1. An induction coil is shown at I. One terminal of the secondary is shown connected to a conductor 110 which leads to the ignition devicenot shown. The other terminal is shown grounded at G*. nected by conductors 106 and 103 to the terminal contact 24. This as previously de scribed is connected to the armature Winding illustrated at 100. This winding is connected by a conductor 101 to ground atIG. The armature winding is short circuited through conductors 105, contacts 17 and 18,

The primary is shown at 2' con bridging the contacts 17 and 18. The armature is normally short circuited, but at intervals this short circuit is interrupted and current will pass through the induction coil. I have used this form of circuit, merely to illustrate the use of my device in connection with a circuit.

While I have shown this particular form and described these particular objects, it will seem obvious to those skilled in the art that numerous and extensive departures from the 'form and details of the a paratus here shown may be made without eparting from the spirit of the invention, the same being herein shown for the purpose of clearly illustrating one specific embodiment thereof.

I claim: v

1. In a dynamo electric machine, the combination of a frame, a rotary armature, mounted in said frame, a shaft therefor, a cammounted on said shaft and adapted to be rotated therewith, a circuit controlling switch consisting of two contacts, on., of which is movable, said movable contact adapted to be operated by said rotary cam said contacts being brought to the frontand being accessible from the outside, a hollow cover for said switch contacts, terminal contacts mounted upon the side of said support connected with the switch contacts, and

a spring connecting the end of the armature shaft to one of said terminals inclosed within said cover.

2. In a dynamo electric machine, the "coini of two contacts, one cit which. is mov ,cn contests adapted to be atiront of the support to inclose s terminal contacts mounted icie cf said snpport, and e spring the enri of the armature shaft contact terminals.

iyne'me electric machine, en armeture, a snei't therefore, the combination of a a flet supposing member rnovsbiy mounte on seici frame, switch contacts carried aid supporting member, a leaf spring upon one end of which one of said switch cont-ectsis mounted, a, hollow cover for said contacts adapted to inclose the same Within a dust proof chamber, terminal contacts connected with said switch contacts mounted on said supporting member outsi-cie said chamber, a, spring Within said cover connecting said armature shaft to one of said terminals, and conductors connected to said terminal contacts outside of said chamber.

In testimony whereof, 1 aflix my signature in the presence of two Witnesses.

WELLIAM W. D EIAN.

Witnesses:

R G. SANDS, F. O. Rzomr. 

